UJ Ramelson Co Dem-Bart Checkering Gauge Tool for measuring existing checkering lines and aids in creating new patterns of work with straight lines. Used to locate lines-per-inch, diamond and other pattern dimensions helping with the over-all checkering layout. Each order includes 1 Checkering Gauge with instructions. The sheet states. "you may use the gauge to measure the pitch of grooves. Accomplished stock makers can use it for templates. The angles at the end of the gauge can be used to determine the angle of intersection of your lines of checkering" etc.... Proudly made in Snohomish WA, USA!